Device for swaging dental cap-crowns.



No. 650,400. Patented May 29,1900.

G. F. KBIEGEB.

DEVICE FOR SWAGING DENTAL GAP GROWNS (Application filed. Dec. 1, 1899.)

r'rEn STATES PATENT Eric.

GEORGE F. KRIEGER, OF CHICAGO, ILLINOIS, ASSIGNOR OF ONE-THIRD TO ADIE B. HORN, OF SAME PLACE.

DEVICE FOR SWAGING DENTAL CAP-CROWNS.

SPECIFICATION forming part of Letters Patent No. 650,400, dated May 29, 1900.

Application filed December 1, 1899. Serial No. 738,800- (No model.)

To all whom it may concern.-

Be it known that I, GEORGE F. KRIEGER, a citizen of the United States of America, and a resident of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Devices for Swaging Dental Cap-Crowns, of which the following is a specification.

My invention relates to devices for swagin g IO dental cap-crowns by means of a casing, plunger, and soft-metal particles,which are forced against the blank for the crown.

The main objects of my invention are, first, to provide for readily removing the parts from I 5 the casing after the crown has been properly formed; second, to prevent lateral spreading or bulging of the crown, and, third, to prevent the particles of soft metal or shot from being forced between the rim of the crown 2c and the male (lie, thus preventing the spreading of said rim.

Further objects of different features shown which aid in rapidly forming a perfect capcrown will be understood from the following description,with reference to the accompanying drawings, in WlllCh-- Figure l is a vertical central section of a device constructed according to myinvention.

Fig. 2 is a horizontal section on the line 2 2 of Fig. 1. Fig. 3 is an inverted perspective view of the sleeve 4, showing its parts slightly separated. Fig. 4 is a plan of the ring 5. Fig. 5 is a top plan of the plunger 6. Fig. 6 is a vertical section of a modification of the 5 plunger 6. Fig. 7 is a top plan of said modified plunger.

The casing 1 has a vertical cylindrical opening extending through the same, which is of uniform diameter. The plunger 3 is seated in the upper part of said opening. Immediately below said plunger 3 is a sleeve 4, which is preferably made of three parts, as shown in Fig. 3. The ring 5 fits in said opening below the sleeve 4 and is also preferably made of 5 three parts, as shown in Fig. 4. The plunger 6 fits in the lower part of said opening. The plunger 7 is to be substituted for the plunger (3 in forming crowns for the incisors.

8 represents a male die, which is made in the usual manner of hard soluble metal.

9 represents the blank for the cap-crown,

which is placed on a die 8 in the position shown. The cap 10 is formed of soft metal and projects over the edge 11 of the cap-crown 9. The sleeve 4 has a hollow center 12 and has its lower end made in funnel shape at 13. The ring 5 has its middle part 14 of less di ameter than the upper and lower ends of said ring. The plunger 6 has its upper end hollowed out at 15, with a central raised part 16. The plunger 7 has its upper part hollowed out orindented at 17,deepening toward the center.

18 represents a filling of shot or other softmetal particles.

The parts 1, 3, 4, 5, 6, and 7 are allprefe'rably made of hardened steel. 1

The operation of the device is as follows: The operator holds the casin g 1 in an inverted position, having first placed therein the plunger 3and sleeve 4. He then fills ina quantity of shot or other soft-metal particles and inserts the die 8 with the caps 9 and 10 thereon in the position shown in Fig. 1. The cap 10 will now rest upon said shot. The operator then adds a small quantity of shot and inserts the ring 5 in proper position to bring its middle part 14 opposite the sides of the cap 9 in about the position shown. More shot is then filled in until the cap 9 is completely covered, and there is a considerable amount of shot above the same. The operator then inserts the plunger 6 firmly against the shot, and then turns the device to an upright position, as shown in Fig. 1. The lower end of the plunger 6 is now placed upon an anvil or other suitable device and the operator strikes the top of the plunger 3, thus forcing said plungers 6 and 3 toward each other. The shot or metal particles 18 will now be forced firmly upon the caps 9 and 10. The ring 5 being of less diameter at its middle part will cause the shot to pack firmly against the sides of the caps 9 and 10. The funnel-shaped end of the sleeve 4 will drive the shot in such manner as to leave the same in a comparativelyloose mass at the upper part of the opening 12. The object of this is to prevent too great vertical force upon the cap 9, and thus avoid the bulging or spreading of said cap. It will be seen that as the plunger 3 is struck downwardly the same carries with it the sleeve 4. The funnel-shaped end 13 of the sleeve4 tends to pack the shot 18 toward the center, thus permitting the shot to be much looser in the upper part of the opening 12. When the lateral pressure against the cap 9 has reached its maximum limit, the shot in the upper part of the opening 12 will pack more closely until the desired maximum vertical pressure is attained,

The raised part 16 of the plunger 6 serves to better pack the shot against the face of the die 8 in case the latter is made for a molar. When a cap for an incisor is to be formed, the plunger 7 is used in place of the plunger 6, the former being the better form to avoid having its surface strike against the face of the cap-crown.

In practice I prefer to first partly swage the cap 9, so that its ends 11 are forced well inwardly against the die 8, and then remove the parts 8, 9, and and substitute a new cap 10. Then I again insert the parts as above described and complete the process of swaging. The object in substituting a new cap 10 before exerting the maximum pressure is to avoid having the soft metal of said cap forced inwardly between the die 8 and the edge 11. To remove the parts from the casing 1, the operator places the lower edge of said casing upon an anvil and strikes the plunger 3 until the soft-metal filling is forced out at the lower end.

The object in making the sleeve 4, ring 5,

' and plungers 6 and 7 of several parts is to aid in removing same from the casing 1.

It will be understood that the sleeve 4, ring 14, and plunger 6 may each be made of a the device shown may be altered in numerous ways without departing from the spirit of my invention. I therefore do not confine myself to such details, except as hereinafter limited in the claims.

What I claim as my invention, and desire to secure by Letters Patent, is-

1; In a device for swaging dental capcrowns, the combination of a casing having an opening of uniform diameter extending entirely through same, a pair of opposed plungers, fitting in said opening, a loose filling of soft-metal particles between said plungers, a male die for insertion in a cap-crown, and means for preventing the entrance of said particles between the rim of the cap-crown and said die, substantially as described.

2. In a device for swaging dental capcrowns, the combination of a casing having an opening of uniform diameter extending entirely through the same, a pair of opposed plungers fitting in said opening, a ring or collar fitting in said opening between the plungers and having its internal diameter decreasing from the top and bottom toward the middle part, substantially as described.

3. In a device for swaging dental capcrowns, the combination of a casing having an opening of uniform diameter extending entirely through the same, a pair of opposed plungers fitting in said opening, a sleeve fit ting in said opening between said plungers and having the opening 12, funnel-shaped at its lower end, substantially as described.

4. In a device for swaging dental cap crowns, the combination of a casing having an opening of uniform diameter extending entirely through the same, a pair of opposed plungers fitting in said opening, a ring or collar fitting in said opening between the plungers and having its internal diameter de creasing from the top and bottom toward the middle part, and a sleeve fitting in said open ing between said collar and one of said plungers and having the central opening 12, funnel-shaped at the end toward said collar, substantially as described.

5. In a device for swaging dental cap crowns, the combination of a casing open at one end; a plunger fitting therein; and a ring or collar in said casing, inward of the plunger, having its internal diameter decreasing from the top and bottom toward the middle part; substantially as described. single piece and that other minor details of 6. In a device for swaging dental capcrowns, the combination of a casing open at one end; a plunger fitting therein; and a sleeve fitting in said casing, inward of the plunger, havingthe opening 12,funnel-shaped at its lower end; substantially as described.

7. In a device for swaging dental capcrowns, the combination of a casing open at one end; a plunger fitting therein; a male die for insertion in a cap-crown; and a softmetal cap 10 for protecting the rim of the capcrown, substantially as described.

Signed by me at Chicago, Illinois, this 25th day of November, 1899.

GEORGE F. KRIEGER.

NVitnesses:

WM. R. RUMMLER, GLEN O. STEPHENS. 

